My date was wrong. It was the 1960s.
https://www.businessinsider.com/biological-agents-were-tested-on-the-new-york-city-subway-2015-11
Very interesting...I was on active duty then but don’t remember this. I do remember CIA or somebody experimenting with hallucinogenic drugs like LSD. Hell, the government even had GI’s dangerously close to ground zero during A bomb tests! Not surprised by anything government might try.
PS Great art work!